Wallender Born

The Wallender Born or Wallenborn (popularly known as the Brubbel) is a cold water geyser in the village Wallenborn (Eifel district, Germany). It is adjacent to the reactivated Andernach Geyser (aka Namedyer Sprudel) an active cold water geyser in Germany.

Experts disagree on whether the Wallender Born can be described as eruptive course, but periodic gas outbreaks have been witnessed since time immemorial. Until being drilled, Wallender Born was therefore at least a (periodic) mofette. The high water surge of a typical hot spring was found only after construction work. The fountain is operated geyser-like: The artificial conduit is located below the water surface of a small pond. The water is therefore not thrown like a fountain, but turbulent. The "fuel gas" of the geyser is carbon dioxide. It contains traces of other gases like hydrogen sulfide which leads to a smell reminiscent of rotten eggs.

Data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).